2.2.4.2.1.4 Variable Count Tokens(xx00xxxx)
This class of token definition is followed by a count of the number of fields that follow the token. Each field length is dependent on the token type. The total length of the token can be determined only by walking the fields. As shown in the following table, a variable count token always has its third and fourth bits set to “0”, and a value of “0 or 1” in the remaining bit positions denotes a bit position that can contain the bit value “0” or “1”.
|
0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
|---|---|---|---|---|---|---|---|
|
0 or 1 |
0 or 1 |
0 |
0 |
0 or 1 |
0 or 1 |
0 or 1 |
0 or 1 |
There are two variable count tokens. COLMETADATA (section 2.2.7.4) and ALTMETADATA (section 2.2.7.1) both use a 2-byte count.